Looking for a way to put your site in "maintanance mode"? based on http://www.webgui.org/etcetera/temporary-disable-editing/1 plainblack included the script called maintenanceMode.pl in /data/WebGUI/sbin/.

According to the documenation:

To set your site in maintenance mode:
perl maintenanceMode.pl --configFile=NameOfYourConfigFile --start

To set your site in working mode:
perl maintenanceMode.pl --configFile=NameOfYourConfigFile --stop

There is a system wide maintenance page that goes up. It can be found at /data/WebGUI/docs/maintenance.html. It can be modified as you wish. Note that this page is displayed for all sites under a single instance of webgui.